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Effective Communication
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exupero
July 25, 2012
Technology
1
390
Effective Communication
A talk for the Detroit Lambda Lounge on CSP and Go.
exupero
July 25, 2012
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Transcript
Effective Communication Or, Why Telepathy Might Not Be Such a
Good Idea Eric Shull (@exupero)
SHARING MEMORY THE PROBLEM:
SHARING MEMORY THE PROBLEM: NON-DETERMINISM
SHARING MEMORY THE PROBLEM: NON-DETERMINISM RACE CONDITIONS
SHARING MEMORY THE PROBLEM: NON-DETERMINISM RACE CONDITIONS DEADLOCKS
SHARING MEMORY THE PROBLEM: NON-DETERMINISM RACE CONDITIONS DEADLOCKS HARD TO
REPRODUCE
SHARING MEMORY THE PROBLEM: NON-DETERMINISM RACE CONDITIONS DEADLOCKS HARD TO
REPRODUCE HARD TO DEBUG
SHARING MEMORY THE PROBLEM: NON-DETERMINISM RACE CONDITIONS DEADLOCKS HARD TO
REPRODUCE HARD TO DEBUG HARD TO ENSURE RELIABILITY
MUTEXES & LOCKS SEMAPHORES COMPARE & SWAP ATOMIC OPERATIONS SYNCHRONIZATION
SOLUTIONS?
WRITE LOCK? WRITE UNLOCK. READ LOCK? FAIL! READ LOCK? DEADLOCK?
GOT IT! GOT IT! COMPLEX
LEAKY
NON-COMPOSABLE
WANTED SIMPLICITY ABSTRACTIONS COMPOSABILITY
WANTED SIMPLICITY ABSTRACTIONS COMPOSABILITY CONCURRENCY
PIPES
PIPESSIMPLE
PIPESSIMPLE COMPOSABLE
PIPESSIMPLE COMPOSABLE NON-LEAKY
PIPESSIMPLE COMPOSABLE NON-LEAKY PARALLEL
CSP COMMUNICATING SEQUENTIAL PROCESSES BY C.A.R. HOARE
PROCESSES
PROCESSES NO THREADS
PROCESSES NO THREADS NO SHARED MEMORY
PROCESSES “GOROUTINES” NO THREADS NO SHARED MEMORY
CHANNELS
CHANNELS COMMUNICATION
CHANNELS COMMUNICATION PASS DATA STRUCTURES
CHANNELS COMMUNICATION PASS DATA STRUCTURES VALUES AREN’T SHARED
ONE-TO-ONE
ONE-TO-MANY
MANY-TO-ONE
MANY-TO-MANY
SOUNDS LIKE ERLANG, EXCEPT... SYNCHRONY ...
SOUNDS LIKE ERLANG, EXCEPT... SYNCHRONY ... CHANNEL, NOT MAILBOX
CSPC.A.R. HOARE
CSPC.A.R. HOARE GO ROB PIKE KEN THOMPSON ROBERT GRIESEMER
CSPC.A.R. HOARE GO ROB PIKE KEN THOMPSON ROBERT GRIESEMER
CSPC.A.R. HOARE SQUEAKROB PIKE LUCA CARDELLI GO ROB PIKE KEN
THOMPSON ROBERT GRIESEMER
CSPC.A.R. HOARE NEWSQUEAK ROB PIKE SQUEAKROB PIKE LUCA CARDELLI GO
ROB PIKE KEN THOMPSON ROBERT GRIESEMER
CHANNELS FUNCTIONS OR GOROUTINES* FUNCTIONS OR GOROUTINES*
CHANNELS FUNCTIONS OR GOROUTINES* FUNCTIONS OR GOROUTINES* *GOROUTINES:
CHANNELS FUNCTIONS OR GOROUTINES* FUNCTIONS OR GOROUTINES* NOT THREADS *GOROUTINES:
CHANNELS FUNCTIONS OR GOROUTINES* FUNCTIONS OR GOROUTINES* NOT THREADS MORE
LIGHTWEIGHT *GOROUTINES:
CHANNELS FUNCTIONS OR GOROUTINES* FUNCTIONS OR GOROUTINES* NOT THREADS MIGHT
HAVE MILLIONS MORE LIGHTWEIGHT *GOROUTINES:
A SITE AGGREGATOR github.com/exupero/csp-demo
POLL SITES A SITE AGGREGATOR github.com/exupero/csp-demo
csp/poll-sites
None
None
POLL SITES A SITE AGGREGATOR
POLL SITES GET SOURCE A SITE AGGREGATOR
csp/queue-content
None
None
POLL SITES GET SOURCE A SITE AGGREGATOR
POLL SITES FILTER QUEUE GET SOURCE A SITE AGGREGATOR
csp/filter-queue
None
POLL SITES FILTER QUEUE GET SOURCE A SITE AGGREGATOR
POLL SITES FILTER QUEUE AGGREGATE MOOD GET SOURCE A SITE
AGGREGATOR
csp/aggregate
None
A SITE AGGREGATOR
A SITE AGGREGATOR SIMPLE EXAMPLE
A SITE AGGREGATOR SIMPLE EXAMPLE DEMONSTRATES GRAMMAR
A SITE AGGREGATOR SIMPLE EXAMPLE DEMONSTRATES GRAMMAR SHOWS COMPOSABILITY
CSP COMMUNICATING SEQUENTIAL PROCESSES
CSP COMMUNICATING SEQUENTIAL PROCESSES PLAY WITH IT UNDERSTAND IT USE
IT